Step 1 

- Install some kind of OS for RPI
i like to use elovalvos images from the forum, but you can use what ever probably,
https://forum.linuxcnc.org/9-installing-linuxcnc/39779-rpi4-raspbian-64-bit-linuxcnc?start=340

or this one but its a bit old
https://github.com/Expatria-Technologies/remora-flexi-hal/releases or this one, kinda old


step 2,

- install the component
https://github.com/cakeslob/Remora/tree/nucleo_static/LinuxCNC/Components

step3 

- load the firmware
https://github.com/cakeslob/Remora/tree/nucleo_static/Firmware/FirmwareBin/NUCLEO_F446RE
drag and drop this thing via usb

step 4 
-  make the cable
https://github.com/cakeslob/Remora-docs/blob/nucleo/docs/source/hardware/nucleo446.rst#wiring-to-raspberry-pi-for-spi-communication

i think i included one of these cables

step 5 

try the config
https://github.com/cakeslob/Remora/tree/nucleo_static/LinuxCNC/ConfigSamples/remora-xy_nuc

stuff might be regressed